Remarkably large 15N, 13C and 18O isotope NMR shifts of the mono-coordinate phosphorus atoms in the compounds (Me3Si)iPrNCP, K+[iPrNCP]- and KOCP · 2 DME (DME = 1,2-dimethoxyethane)

被引：0

作者：

Heckmann, Gernot ^{[1
]}

Becker, Gerd ^{[1
]}

Horner, Stephen ^{[1
]}

Richard, Herbert ^{[1
]}

Kraft, Hans ^{[1
]}

Dvortsak, Peter ^{[2
]}

机构：

[1] Inst. für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany

[2] Bruker Analytik GmbH, Silberstreifen, D-76287 Rheinstetten, Germany

来源：

Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences | 2001年 / 56卷 / 02期

关键词：

Nuclear magnetic resonance spectroscopy - Carrier mobility;

D O I：

10.1515/znb-2001-0206

中图分类号：

TM23 []; TN304 [材料];

学科分类号：

摘要：

The 31P and 13C NMR spectra of the heteroatom-substituted λ3-phosphaalkynes (Me3Si)-iPrNCP (1), K+[iPrNCP]- (2) and KOCP · 2 DME (3) are described (Me = methyl; iPr = isopropyl). In addition, 15N NMR data of 1 and 2 as well as further NMR results of all accessible nuclei of 1 to 3 are reported. The absolute values of the coupling constants 1J(31P13C) of 1, 2 and 3, 18.2, 45.7 and 57.2 Hz, respectively, are considerably different; the geminal coupling constants 2J(31P15N) of the first two compounds show a decrease in the reverse order, 15.1 and 3.3 Hz. 13C, 29Si, 15N, and 18O isotope effects on the nuclear shielding of the 31P nucleus in the non isotope-enriched compounds 1, 2 or 3 are presented and discussed. The [mono-13C]isotopomers of 1, 2 and 3 exhibit extremely negative 31P13C one-bond isotope shifts varying from -211 to -223 ppb. Remarkably, for 1 and 2 large two-bond 31P15N isotope shifts of-32 and -84 ppb, respectively, are observed. An unexpectedly large two-bond 31P18O isotope effect of -124 ppb was assigned to the [mono-18O]isotopomer of compound 3. A three-bond 31P13C isotope shift of-27 ppb was found in 2.

引用

页码：146 / 151